UITableView底部FooterView实现上拉刷新

转载自:http://carlme.blog.163.com/blog/static/183716327201272421728204/

 

@interface FooterViewTestViewController : UIViewController <UITableViewDataSource, UITableViewDelegate>{



// 表格数据数组，因为是演示代码，直接定义为数组

NSMutableArray *tableData;



// 下拉时显示的数据

NSMutableArray *tableMoreData;



// 数据数量

NSUInteger dataNumber;



// 加载状态

BOOL _loadingMore;



UITableView *table;

}



 



@property (nonatomic, retain) UITableView *table;

@property (nonatomic, retain) NSMutableArray *tableData;

@property (nonatomic, retain) NSMutableArray *tableMoreData;



 

// 创建表格底部

- (void) createTableFooter;



// 开始加载数据

- (void) loadDataBegin;



// 加载数据中

- (void) loadDataing;



// 加载数据完毕

- (void) loadDataEnd;



@end



 



 



@implementation FooterViewTestViewController



@synthesize table;

@synthesize tableData;

@synthesize tableMoreData;



- (void)viewDidLoad {



    [super viewDidLoad];



　　table = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 320, 460) style:UITableViewStylePlain];

　　table.delegate = self;

　　table.dataSource = self;

　　[self.view addSubview:table];



　　tableData = [[NSMutableArray alloc] initWithObjects:

@"January",@"February",@"March",@"April",@"May",@"June",

@"July",@"August",@"September",@"October",@"November",@"December",nil];



　　tableMoreData = [[NSMutableArray alloc] initWithObjects:@"BAIDU",@"GOOGLE",@"FACEBOOK",@"YAHOO",nil];


　　[self createTableFooter];

}



 



#pragma mark -

#pragma mark Table view data source

// Customize the number of sections in the table view.

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

    return 1;

}



// Customize the number of rows in the table view.

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    return [tableData count];

}



// Customize the appearance of table view cells.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *CellIdentifier = @"Cell";



    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {

        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];

    }



　　cell.textLabel.text = [tableData objectAtIndex:indexPath.row];

    return cell;

}





- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate

{    

    // 下拉到最底部时显示更多数据

　　if(!_loadingMore && scrollView.contentOffset.y > ((scrollView.contentSize.height - scrollView.frame.size.height)))

　　{

　　　　[self loadDataBegin];

　　}

}



 



// 开始加载数据

- (void) loadDataBegin{

    if (_loadingMore == NO) 

    {

        _loadingMore = YES;



        UIActivityIndicatorView *tableFooterActivityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(75.0f, 10.0f, 20.0f, 20.0f)];

        [tableFooterActivityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleGray];

        [tableFooterActivityIndicator startAnimating];

        [self.table.tableFooterView addSubview:tableFooterActivityIndicator];



　　　　[self loadDataing];



    }

}



 



// 加载数据中

- (void) loadDataing

{

　　dataNumber = [tableData count];

　　for (int x = 0; x < [tableMoreData count]; x++) 

　　{

　　　　[tableData addObject:[tableMoreData objectAtIndex:x]];

　　}



　　[[self table] reloadData];

　　[self loadDataEnd];

}



 

// 加载数据完毕

- (void) loadDataEnd{

　　_loadingMore = NO;

　　[self createTableFooter];

}



 



// 创建表格底部

- (void) createTableFooter{



    self.table.tableFooterView = nil;

    UIView *tableFooterView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, self.table.bounds.size.width, 40.0f)]; 

    UILabel *loadMoreText = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 116.0f, 40.0f)];

    [loadMoreText setCenter:tableFooterView.center];

    [loadMoreText setFont:[UIFont fontWithName:@"Helvetica Neue" size:14]];

    [loadMoreText setText:@"上拉显示更多数据"];

    [tableFooterView addSubview:loadMoreText];    

 



    self.table.tableFooterView = tableFooterView;

}



@end